Just have a symbol that looks like a jeep in the CI style that pops up in the corner, that way you know you can enter a vehicle and you don't have to waste time by instinctively reading the text.
haha. amazing. XD
reading words takes 500mili synapses in the brain, while recognizing images takes only 180mili. haha
its like saving brain bandwidth. hahaha... are you by any chance a computer programmer or networking consultant? hehehehe
anyway, this might be a good idea.
the only thing wrong with the current system though, is that you get injured upon entry, and even if you touch a static vehicle. i like vehicle damage, but i think it should be modified so that it only hurts you if the vehicle is moving.
damage could also be proportionate to its speed, so that a zooming fast speeding car would kill you on impact, but if someone is just lazing by in a jeep, and they graze you, then you just get slightly hurt.